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RE: question about rates and percentages
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<P><FONT SIZE=2>Rates are usually quoted as 1-2 per 100, or 10-20 per 1,000, using standard Epi denominators. For rarer disorder like SBS, we use 1-2 per 100,000.</FONT></P>
<P><FONT SIZE=2>The rate implies numbers of cases over time, but can also be expressed as a percentage. Be careful: we are talking about incidence, not prevalence. Prevalence rates are thought to be higher, plateauing at 25% or more by the age of 18y.</FONT></P>
<P><FONT SIZE=2>==============================================</FONT>
<BR><FONT SIZE=2>Vincent J. Palusci, MD MS</FONT>
<BR><FONT SIZE=2>DeVos Children's Hospital Child Protection Team</FONT>
<BR><FONT SIZE=2>Associate Professor, Michigan State University</FONT>
<BR><FONT SIZE=2>100 Michigan Street, MC-178</FONT>
<BR><FONT SIZE=2>Grand Rapids, MI 49503</FONT>
<BR><FONT SIZE=2>616-391-1242, fax: 616-391-3206 </FONT>
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<P><FONT SIZE=2>-----Original Message-----</FONT>
<BR><FONT SIZE=2>From: bill higgins [<A HREF="mailto:bill_higginsus@yahoo.com";>mailto:bill_higginsus@yahoo.com</A>]</FONT>
<BR><FONT SIZE=2>Sent: Tuesday, August 19, 2003 2:00 PM</FONT>
<BR><FONT SIZE=2>To: Child Maltreatment Researchers</FONT>
<BR><FONT SIZE=2>Subject: question about rates and percentages</FONT>
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<P><FONT SIZE=2>I have a basic question about rates and percentages. </FONT>
<BR><FONT SIZE=2>If the rate of maltreatment is 5,000 for every 100,000</FONT>
<BR><FONT SIZE=2>children under 18.....does this mean that 5% of the</FONT>
<BR><FONT SIZE=2>population under 18 is at risk of maltreatment? If</FONT>
<BR><FONT SIZE=2>not, could someone clarify the difference between</FONT>
<BR><FONT SIZE=2>rates and percentages. What is the benefit of</FONT>
<BR><FONT SIZE=2>reporting one over the other? Thanks you for helping</FONT>
<BR><FONT SIZE=2>me with this problem.</FONT>
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<P><FONT SIZE=2>Bill</FONT>
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